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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _dos_close function uses system call 0x3E to close the file
     indicated by <handle>. The file's <handle> argument is returned by
     the call that created or last opened the file.
 
     Return Value
 
     The function returns 0 if successful. Otherwise, it returns the
     DOS error code and sets errno to EBADF, indicating an invalid file
     handle.
 
     Do not use the DOS interface routines in conjunction with the
     console, low-level, or stream I/O routines.
                                    -♦-